期刊
ENVIRONMENTAL POLLUTION
卷 315, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2022.120367
关键词
Reclaimed wastewater; iPPCPs; Plant uptake model; Speciation
资金
- USDA grant [2017- 69007-26309]
- NSF [1808372, 2108270]
- Direct For Mathematical & Physical Scien [1808372] Funding Source: National Science Foundation
- Division Of Chemistry [1808372] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [2108270] Funding Source: National Science Foundation
This study developed a model to simulate the speciation and fate of ionizable pharmaceutical and personal care products (iPPCPs) in soils and their uptake by plants, and found that pH plays an important role in regulating plant uptake. The simulation showed that it took 89-487 days for iPPCPs to reach steady-state concentrations in soil and plant tissues, and the concentrations in plant tissues at pH 9 were higher than those at pH 5. The study also emphasized the importance of considering pH and speciation when simulating the fate of iPPCPs in the soil-plant system.
A model was developed to simulate the pH-dependent speciation and fate of ionizable pharmaceutical and personal care products (iPPCPs) in soils and their plant uptake during thedt application of reclaimed wastewater to agricultural soils. The simulation showed that pH plays an important role in regulating the plant uptake of iPPCPs, i.e., ibuprofen (IBU; with a carboxylic group), triclosan (TCS; phenolic group), and fluoxetine (FXT; amine group) as model compounds. It took 89-487 days for various iPPCPs to reach the steady-state concen-trations in soil and plant tissues. The simulated steady-state concentrations of iPPCPs in plant tissues at pH 9 is 2.2-2.3, 2.5-2.6, and 1.07-1.08 times that at pH 5 for IBU, TCS, and FXT, respectively. Assuming sorption only for neutral compounds led to miscalculation of iPPCPs concentrations in plant tissues by up to one and half orders magnitude. Efflux of compounds in soil, lettuce leaf, and soybean pods was primarily contributed by their degradation in soil and dilution due to plant tissue growth. Overall, the results demonstrated the importance of considering pH and speciation of iPPCPs when simulating their fate in the soil-plant system and plant uptake.
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